257357961 has 12 divisors (see below), whose sum is σ = 424844992. Its totient is φ = 147061656.

The previous prime is 257357959. The next prime is 257357981. The reversal of 257357961 is 169753752.

257357961 is a `hidden beast` number, since 2 + 5 + 73 + 579 + 6 + 1 = 666.

It is not a de Polignac number, because 257357961 - 2¹ = 257357959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257357911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2042461 + ... + 2042586.

Almost surely, 2^257357961 is an apocalyptic number.

257357961 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

257357961 is a deficient number, since it is larger than the sum of its proper divisors (167487031).

257357961 is a wasteful number, since it uses less digits than its factorization.

257357961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085060 (or 4085057 counting only the distinct ones).

The product of its digits is 396900, while the sum is 45.

The square root of 257357961 is about 16042.3801538300. The cubic root of 257357961 is about 636.0811647335.

The spelling of 257357961 in words is "two hundred fifty-seven million, three hundred fifty-seven thousand, nine hundred sixty-one".